RELATIONSHIP BETWEEN STRUCTURAL LOCAL DAMAGE AND DYNAMIC BEHAVIOR
Damage in the structures alters the structural dynamic behavior. Damage generally occurs locally in the components of structures, and its effect often exhibits in the change of both the local and global characteristics. Maintaining safety and integrity of structures due to catastrophic failure caused by undetected damage requires a better understanding of the relationship between local damage and structural dynamic behavior. In return, better understanding of this relationship helps monitor and assess the condition of structures and develop dynamics-based structural health monitoring techniques. It is also quite essential in design of structures subjected to dynamic loads. In this study, the relationship between the local damage and structural dynamic behavior is investigated. As a demonstration, the experiment of a three-dimensional (3-D) steel frame structure with different magnitudes of local damage is conducted to validate the concept. The damage in the frame structure is simulated by a crack with the different depths cross the whole width in a pillar of the 3-D frame structure. The sweep-sine resonance test is applied to study the relationship between the local damage and global/local dynamic response. The experimental results indicate that the change of global resonant response between the intact and damage structures is not obvious. All the maximum change of the global resonant response takes place for the case in which the pillar is fully separated. The change of local resonant responses measured near the location of saw-cut crack damage is quite significant. The local resonant responses near the damage increase at the low order resonance when the crack depth increases; whereas the changes at the high order resonance between the intact and damage structures are minor. The experimental study conducted indicates that the local resonant responses at the low order resonance can be used as an effective damage identification method to detect and quantify the local damage in the 3D frame structures.
Local damage dynamic behavior relationship global resonant response local resonant response
Shanshan Wang Qingwen Ren Pizhong Qiao
Department of Engineering Mechanics, Hohai University, Nanjing, Jiangsu 210098, P.R.China Department of Civil and Environmental Engineering, Washington State University, Pullman, WA 99164-29
国际会议
The Fifth International Conference on VETOMAC-V(第五届振动工程及机械技术国际会议)
武汉
英文
486-494
2009-08-27（万方平台首次上网日期，不代表论文的发表时间）